/*
-10

 */
#include <iostream>
using namespace std;
class Integer{
	private:
		int i ;
	public:
		Integer(int m=0):i(m){}
		void print(void){
			cout << i << endl;
		}
		const Integer operator-(){
			return Integer(-i);
		}
};
int main(void){
	Integer a(10);
	Integer b = -a;
	b.print();
	return 0;
}
